将子视图添加到UIWindow有什么缺点？

Question

I am new to ios developement, actually i want to add UICollectionView to top of everything. So, for that i am adding this to UIWindow, what basically i want to know that is there any disadvantage to adding UICollectionView to UIWindow. If yes then, Is there any way of adding any object to the top of everything? Thanks.

Answer 1

Usually the idea of the UIWindow is to hold 1 rootViewController and not play with that too much, only use it in cases you need to get the main view.

The right way to do so is to have 1 main NavigationController and to override it with what-ever kind of top view you want (ie side menu, various overlays, etc..), this way its always accessible from the subControllers and you have a complete handling of that inside a UIViewController with all of the relevant delegate methods.

Answer 2

除此之外，它通常被认为是不好的做法， UIKit应该为您提供另一种方法来避免这种用法，我能想到的最大问题是直接添加到UIWindow视图不响应设备方向的变化（旋转）事件，不会与UI的其余部分一起旋转。